Polycarboxyl magnetic silicon nanosphere immobilized platinum catalyst as well as preparation method and application thereof

A magnetic nano-platinum catalyst technology, applied in catalytic reactions, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of expensive metal platinum, low catalytic activity, and many by-products, and achieve enhanced catalytic efficiency , excellent catalytic activity and high mechanical strength

Inactive Publication Date: 2018-06-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the catalytic systems widely used in industry are platinum complexes and supports, and most of them have three main disadvantages: first, the metal platinum is expensive, and the catalyst metal platinum is easy to fall off and difficult to recycle; second, the recycling rate of the catalyst is low. The third is that

Method used

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  • Polycarboxyl magnetic silicon nanosphere immobilized platinum catalyst as well as preparation method and application thereof
  • Polycarboxyl magnetic silicon nanosphere immobilized platinum catalyst as well as preparation method and application thereof
  • Polycarboxyl magnetic silicon nanosphere immobilized platinum catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] (1) Preparation of ethylenediaminetetraacetic dianhydride (EDTA dianhydride, EDTAD):

[0072] Weigh 20g of ethylenediaminetetraacetic acid (EDTA) in a 100mL three-necked flask, and add 34mL of pyridine and 26mL of acetic anhydride to the three-necked flask successively (the molar ratio of ethylenediaminetetraacetic acid, pyridine, and acetic anhydride is 1:1:1.2 ), mechanically stirred and refluxed at 65°C for 24 hours; after the reaction was completed, the solid product was obtained by suction filtration, and the solid product was washed and dried with anhydrous ether to obtain the crude EDTAD; the crude EDTAD was placed in a 100mL conical flask, and 55mL of Acetic anhydride (the weight ratio of acetic anhydride to EDTAD crude product is 3:1), stirring intermittently for 30min, after suction filtration, washing with acetic anhydride and anhydrous ether successively, suction filtration, vacuum drying at 65°C to obtain the EDTAD product and place it in a dry place spare ...

Embodiment 2

[0084] Adopt the method of embodiment 1 to carry out catalyst preparation multi-carboxyl magnetic nano-silicon sphere immobilized platinum catalyst, and its difference only is that the anhydrous solvent that adds in the nano-ferric oxide magnetic silicon sphere in step (4) is cyclohexane.

Embodiment 3

[0086] Adopt embodiment 1 method to carry out catalyzer preparation multi-carboxyl magnetic nano-silica sphere immobilized platinum catalyst, its difference only is that the chloroplatinic acid-isopropanol solution volume in step (6) is 5mL (amino nano-magnetic silicon sphere carrier and chloroplatinum The weight ratio of chloroplatinic acid in the acid solution is 12.6:1).

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Abstract

The invention belongs to the technical field of a precious metal catalyst, and discloses a polycarboxyl magnetic silicon nanosphere immobilized platinum catalyst as well as a preparation method and application thereof, wherein the catalyst is that platinum nanoparticles are uniformly dispersed on the surface of a polycarboxyl magnetic silicon nanosphere carrier; the preparation method adopts a nano ferrosoferric oxide magnetic sphere as a core; the nano ferrosoferric oxide magnetic silicon sphere is prepared by coating silicon dioxide by a sol-gel method, and carboxyl functionalization is performed to obtain a polycarboxyl magnetic silicon nanosphere carrier, and then the metal platinum is immobilized to obtain the polycarboxyl magnetic silicon nanosphere immobilized platinum catalyst. A cheap and easily available material is adopted as an immobilizing material, phosphorus or sulfur is not involved in the preparation process, and the polycarboxyl magnetic silicon nanosphere immobilizedplatinum catalyst is prepared which has high activity, selectivity and reusability and is successfully applied to hydrosilylation between n-hexene, n-heptylene, n-octylene, trans-2-hexene, cis-2-hexene, trans-3-hexene, cis-3-hexene and dichloromethylsilane.

Description

technical field [0001] The invention belongs to the technical field of noble metal catalysts, and in particular relates to a nano-material immobilized noble metal platinum catalyst compatible with magnetism and easy separation, as well as its preparation method and application. Background technique [0002] Precious metal catalysts play a very important role in the development of today's society. According to their use forms, they can be divided into homogeneous catalysts and heterogeneous catalysts. Among them, heterogeneous catalysts, that is, supported metal catalysts, can be recycled because they are easy to separate from the liquid reaction system. , is widely used in the production of medicine, pesticide, fine chemical industry, seasoning, fragrance and health care products in industry [1-3] . With magnetic ferric oxide (Fe 3 o 4 ) is a carrier of noble metal catalysts, which is a magnetic material with specific particle size and superparamagnetism, and has been use...

Claims

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Application Information

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IPC IPC(8): B01J31/04B01J31/28B01J35/02B01J35/08C07F7/14
CPCB01J31/04B01J31/28B01J35/0033B01J35/023B01J35/08B01J2231/323C07F7/14
Inventor 李优鑫包建民李来明
Owner TIANJIN UNIV
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